| Kingdom: Fungi |
| Phylum: Ascomycota |
| Subphylum: Pezizomycotina |
| Class: Dothideomycetes |
| Subclass: Dothideomycetidae |
| Order: Pleosporales |
| Family: Pleosporaceae |
| Genus: Alternaria |
| Subject: Alternaria helianthi (Hansf.) Tubaki & Nishih. |
| Kingdom: Plantae |
| Phylum: Magnoliophyta |
| Class: Magnoliopsida |
| Subclass: Asteridae |
| Order: Asterales |
| Family: Asteraceae |
| Genus: Helianthus |
| Subject: sunflower |